Short-turn device for pole trucks



H. L. NELSON SHORT TURN DEVIGE FOR POLE TRUCKS July 28, 1925 Filed Aug.51, 1923 INVENTOR. Z- W Anmrzmvx Patented July 28, 1925.

' HENRY L. NELSON, OFGANNON FALLS, MINNESOTA.

SHORT-TURN DEVICE FOR POLE-TRUCKS.

Application filedAugust 31, 1923.

To all whom it may concern."

Be it known that I, HENRY L. 'NnLsoN, a citizen of the United States,residing at Cannon Falls, in the county of Goodhue and State ofMinnesota, have invented certain new and useful Improvements in Short-Turn Devices for Pole Trucks, of which the following is a specification.

My invention relates to attachments for pole trucks of harvesting andother implements and the object is to provide a simple and efficientanti-tipping device for such trucks. f

In the accompanying drawing:

ig. .1 is a top view of a portionof a binder, the draw bar of saidbinder and pole truck for same with my improvement attached. 7

Fig. 2 is an enlarged section on line 22 in Fig. 1.

Fig. 3 is an elevation on line 33 in Fig. 2.

Referring to the drawing by reference numerals, 5 in Fig. 1 representsthe front part of a binder or other farm implement to which is pivotallysecured as at 6 a draw bar 7. 8 is a brace secured as at 9 to the drawbar and pivotally secured as at 10 on the implement, to brace the poleand keep it in right relation to the implement.

11 in Fig. 2 is a whiifletree pivoted on bar 7 as at 12 for drawing thebinder by horse-power and it may also be a member of a suitable evenerpermitting more horses to be used on one side of the draft pole than theother. Said draft pole has its rear end pivotally supported on the axle14, (as at 15) of a pole truck having two flanged wheels 16 and 16journaled on the right and left ends respectively of said axle.

17 is a vertically disposed bracket secured as at 18 to the under sideof bar 7 near its front end. The lower end of it is ball shaped as at 17to engage a socket 19 se cured at 20 on the top side of the draft poleor tongue 13 at a point forward of the axle 14.

The construction above set forth is com mon to many pole trucks. Mydevice in volves a few minor changes in this construction and thesecuring of additional parts designed to prevent the tipping tendency ofprevious pole trucks whenever it is desired to make a turn. It will bereadily understood that in such Serial No. 660,364.

former pole trucks the axle 14 and pole 13 are held rigidly at rightangles to each other by angularly arranged braces 21 the rear ends ofwhich are secured to the axle neareach wheel and the front ends securedto the pole at a common point (not shown) forward of the axle 14. Thuswhen it is desired to make a left turn with dotted in Fig. 1 the rigidposition of the tongue 13 would be as indicated in dotted line 13 andthe direction of pullby-the horses is indicated by arrow 13". Said pullis of course exerted at pin 12 of the draw bar 7 and beingdirected inadirection to the left of its center, the-draw bar through its ball jointexerts a' direct side pressure on the truck pole 13. Inasmuch as theball joint is forward of the axle the left 7 turn causes the left truckwheel to swing under the draw bar 7 and the right hand wheel is swungforward obliquely. The pull at point 12 on the draw bar being to theleft and the truck wheel 16 being swung under said bar the side pressurehas a tendency to make said left wheel dig into the ground andsimultaneously wheel 16 is forced upwardly and the result is a tippingof the entire pole truck that renders it practically useless.

I have found that by keeping the direction of the pull forward of pivot12 as nearly as possible in a straight line with the longitudinal centerof the draw bar, while a turn is being made, the pole truck may beturned at a comparatively sharp angle and no tipping will occur. Themeans for accomplishing this are as follows The draft pole or tongue 13is pivotally secured to the axle 14 (as at 15 in Figs. 2 and 3) and theaxle braces 21 have their front ends secured together by a vertical bolt22 which is passed through the center of a bar 23 arrangedlongitudinally under the tongue and the draw bar. The forward end ofsaid bar is pivotally secured as at 24 to the under side of the draftpole 13 and the rear end of the bar is loosely bolted and supportedas at25 (Figs. 2 and 3) 0n the horizontal part of a U-shaped hanger suspendedfrom a horizontally arranged bolt 27 in draw bar 7. Bolts 24 and 25 areequidistant from bolt 22 and the bar 23 is pref erably a heavy fiatsteel bar. In making a the pole truck to about the position shown i hdrawn the original alinement. The pivot bolt 22 being secured to thebraces 21 thus cause the axle 14 and wheels16 to be turned faster thanthe tongue, the result being that as longas'turning of the poleor'tongue 13 is taking place there is a side strain of bar -23 "whichbeing fixed with axle, the pole 13 gradually assumes a'more obtuse anglewith relation to the axle. This side movement of tongue or pole 13relation to the and consequent'swingingof the axle creates whatmaybe-called a side strain or tension inthe parts just described, all in ahorizontal plane underneath the draft pole or tongue 13 and levelwithfthe axle. The turning force thus being exerted on a low level andthe level of the axle there is no other force tending to tip the truckaxle the wheels of which will ride on the "ground "intheirpr'operhorizontal relation.

normally at right angles thereto, at its center is.

said axle,

other,- longitudin ally under the draw bar and draft What I claim is rIn a pole truck device of the class described, a two wheeled trucka'tongue pivotally secured on the axle of said truck and means adjacentsaid pivot on the tongue for pivotally supporting a'draw bar of anagricultural implement, means mounted to operate substantially in ahorizontal plane with the truck axle and operatively connected with thetongue and the draw bar, to

swing the pole truck niorerapidly than the tongue when the tongue andthe draw bar are brought out of alinement with each said meanscomprising a bar arranged pole,- the forward end of said barpivotallysecured to the tongue forward of the truck axle and the rear end of saidbar pivotally secured to a hanger bracket depending from the draft polerearward of the truck axle,

axlebraces secured to the axle at points adjacent the wheelsandextending forwardly diagonally to a common pivot on said bar.

In testimony whereof I afiix my signature. a L. 1 NELSON.

